Moreover, serum PGLYRP2 was negatively correlated with HDL-c (r = 0.3746, P < 0.05) and Apo-A1 (r = 0.4523, P < 0.01), but positively correlated with Apo-B/A1 (r = 0.3.74, P < 0.05) in SLE patients (Fig. 4B). Here, APOA1 is linked to systemic lupus erythematosus.